Raise-fold line is good, though you probably raised more than you had to. Even a minraise on such a dry board would have got you the information you needed.

The results are funny and the BB's play in this hand is a great example of why you always 3bet with KK. If he had 3bet to $4 he would have won $1.30 instead of losing $9.50. Hell, he might have doubled up, if you perceived him to be squeezing and took him on with 10s.